fix: indicators comprehensive empty prices and stoch RSI guard

backend/routers/indicators_api.py

@@ -331,8 +331,12 @@ def calculate_stoch_rsi(prices: List[float], rsi_period: int = 14, stoch_period:
         k_values = []
         for i in range(3):
             idx = -3 + i
-            r_high = max(rsi_values[idx-stoch_period+1:idx+1]) if idx+1 <= 0 else rsi_high
-            r_low = min(rsi_values[idx-stoch_period+1:idx+1]) if idx+1 <= 0 else rsi_low
+            window = rsi_values[idx - stoch_period + 1:idx + 1] if idx + 1 <= 0 else recent_rsi
+            if not window:
+                k_values.append(50)
+                continue
+            r_high = max(window)
+            r_low = min(window)
             curr = rsi_values[idx]
             if r_high != r_low:
                 k_values.append(((curr - r_low) / (r_high - r_low)) * 100)
@@ -1400,6 +1404,8 @@ async def get_comprehensive_analysis(
 ):
     """Get comprehensive analysis with all indicators"""
     try:
+        base_symbol = symbol.upper().replace("USDT", "").replace("USD", "").strip() or symbol.upper()
+
         # Try to import coingecko client
         try:
             from backend.services.coingecko_client import coingecko_client
@@ -1412,12 +1418,13 @@ async def get_comprehensive_analysis(
         ohlcv = None
         if client_available:
             try:
-                ohlcv = await coingecko_client.get_ohlcv(symbol, days=365)
+                ohlcv = await coingecko_client.get_ohlcv(base_symbol, days=365)
             except Exception as fetch_err:
                 logger.error(f"Failed to fetch OHLCV data: {fetch_err}")
                 ohlcv = None
         
-        if not ohlcv or "prices" not in ohlcv:
+        prices_data = ohlcv.get("prices") if isinstance(ohlcv, dict) else None
+        if not prices_data:
             try:
                 from backend.services.binance_client import binance_client
                 candles = await binance_client.get_ohlcv(symbol, timeframe=timeframe, limit=200)